Means for sinking dies



.` T. M. REES.

MEANS FOB SINKING DIES. APPLlcATloN vFILED FEB. 28. |920.

1,435,552, mnaNov. 14,1922.

2 SHEETS-SHEET 2.

Patented Nov. 14, i922.

Mini entre@ flan e MEANS FR SINKING DIES.

Application led `lebruarv 28, 1920.

To allwhom t may concern.'

Be it known that I, THOMAS MonGAN Rans, a subject of the Kingdom of Great Britain, residing at 48 Defoe Avenue, Kew Gardens, in the county of Surrey, England, have invented certain new and useful Improvements in the Means for Sinking Dies, of which the following is a specification.

This invention relates to an improved means for sinking dies and involves a steel block or the like upon which the shape of the die to be made is formed.

An object of the present invention is to provide means whereby the metal during the forging process is prevented from spreading or splashing out, this object being attained, according to the present invention, by the provision of an outer wall or upstanding flange upon the steel block adapted to surround the print or form upon which the die is sunk by a forging process, thus retaining a greater body of metal between the tools during the forging operation, and thereby obtaining a more perfect impression of the print or form.

Further improvements in this invention consist of the provision of a step or face around the inside of the base of the wall for the purpose of enabling measurements to be readily taken of actual depths of the impression formed in the die as well as for enabling the die to be more easily set in a true parallel position when effecting the machining of the die to the required face, and also the provision of a facial groove or grooves around the` print or form, which groove or grooves is or are connected with other facial grooves on the underside of the block by a series of vertical holes or passages for the purpose of allowing the air toescape during the process of sinking the die.

In order that this invention may be clearly understood and readily carried into practice, reference may be had to the appended explanatory sheet of drawings, upon which:- y

Figure 1 is a sectional elevation of a sinking form according to the present invention, the section being taken on line 1 1 of Figure 2.

Figure 2 is a plan of the form.

Figure 3 is a sectional elevation on line 2 2 of Figure 2.

Figure 4 is a sectional view illustrating the working of the invention. 1

Serial No. 362,087.

In an embodiment of this invention the form consists of a steel block a having the print or form Z) of the die to be forged on its surface, a wall or upstanding flange c being arranged around such print form b, the interior face c1 of such wall or flange c being slightly inclined inwardly from the top of the wall to its face. A step l is provided around the interior base of the wall c which step Z is arranged at the same level as that occupied by a line which represents the face of the die after such face has been machined to the required extent, and between the riser of such step Z and the edge of the print or form Z) a groove e is provided in the block which groove e surrounds the print or form b and the bottom of which groove is a distance below the step which is equal to the amount of metal which requires to be ma.- clnned oli the die to obtain the required face, the amount of metal required to be machined off varying in accordance with the size and depth of the impressions formed in the die.

For the purpose of allowing the air to escape when the die is being sunk by the forging process, vertical holes f are drilled through the block a, such holes f being located at intervals around the groove e, similar grooves g being formed on the underside of the block a to communicate with the sides for permitting of the free escape of the air and whereby more perfect impression is obtained all round the outer edge of the print or form when the surface of the die has been machined off to the required extent.

Figure 4 of the drawings shows thematrix or die a operating upon the working piece t and makes clear what happens in practice and in this figure it will be seen that very small projections of the working piece 7L enter the air vents j", but the same are left open for the main part of their length, and so operate satisfactorily. Further it will be seen that the metal of the working piece )i lfalls away at the points z' and y'Y and the flange c is for the purpose of preventing the metal from unduly spreading away from the working piece b.

What I claim as my invention and desire to secure by Letters Patent is 1. A block having a die form on it-s surface, an upstanding wall extending around and spaced from the die form, a step around the interior base of the wall, and a groove between the die form and the step, and air vent openings leading from said groove.

2. A block having a die forrn on its surface, an upstendng Wall extending around 5 and spaced rom the die form and having its inner 'face outwardly and upwardly nolned, a step around the interior base of the Wall, and a groove between the die form and the s tep, und air Vent openings leading from said groove.

In Witness whereof I have hereunto set my hand.

THOMAS MORGAN BEES. 

